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You can get a 503 rebuild video here http://www.ultralightnews.ca/videos/.
I can't say if it gives you torque specs, as I haven't actually seen it, but might be helpful to see how its done.
S9pilot

533
Taken at Chapter 1012 annual corn roast.

532
Taken at Chapter 1012 annual corn roast.

531
Taken at Chapter 1012 annual corn roast.

530
Taken at Chapter 1012 annual corn roast.

529
Taken at Chapter 1012 annual corn feed.

528
Cub fly by at EAA chapter 1012 annual corn roast.

Edgar,
This might be the video you are thinking of. It mentions the levil unit above that Michael provided the link for.
http://bcove.me/zrp3aunr
Brian

240
Love the colour scheme of this T-28. Oshkosh 2011.

239
This Safari helicopter flew over me while waiting for the bus to the seaplane base. Oshkosh 2011.

238
The Brat III on a slow flyby. Oshkosh 2011

237
This little rocket looks like a blast to fly. Oshkosh 2011.

236
This was the only shot I got of this plane without a pylon or orange vested volunteer. Beautiful airplane. Oshkosh 2011.

235
This beautiful kitfox flew frequently with the ultralights. Oshkosh 2011.

234
Taken down on the farm Oshkosh 2011.

233
Taken during warbird show Oshkosh 2011.

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C-47 landing on 27. I suspect it was an oil fire on the starboard engine. The flames are clearly visible behind the right cowling. They taxied off the runway and the fire trucks came, but the...

231
I got this shot at the south end of 18-36. Oshkosh 2011.

230
I think this Slipstream's wing was lifted by a gust on takeoff. I caught the wing at its lowest point in this pic. The pilot reacted quickly and leveled the wings. Down on the farm at Oshkosh...

229
Taken at Oshkosh 2011.

228
Taken at Oshkosh 2011.

A basic Ultralight in Canada can have a maximum of 2 seats, a max gross weight of 1200 pounds, stall at 45mph or less at gross weight and must have a minimum useful load of (175+1/2engine...